Grate-bar.



No. 645,899. Patented Mar. 20, I900.

J. FISHER.

GRATE BAR.

lApplication filed Oct. 16, 189$).v (No Model.)

2 Sheets-Sheet l,

Z I n nnuu c nwung-nzqm No. 645,899. Patented Mar. 20, I900. J. FISHER.

GRATE BAR.

(Application filed Oct. 16, 1899.) (No Model.) 2 Sheets-Sheet 2 FIG-.5-

m: uoams PEI'ERS cm. PHOTO-LlTHO-, WASHINGTON, u. c,

. Improvements in Grate-Bars; and I do hereby JAMES FISHER, OF NEWORLEANS, LOUISIANA;

GRATE-BAR;

SPECIFICATION forming part of Letters Patent No.

645,899, dated March 20, leoo.

Application filed October 16, 1899. Serial No. 733 ,818- (No model.)

To all whom it may concern.-

Be it known that 1, JAMES FISHER, a citizen of the United States,residing at New Orleans, in the parish of Orleans and State ofLouisiana, have invented certain new and useful,

declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My present invention relates to improveinents in grate-bars, and moreespecially to hollow blast grate-bars for use in burning bagasse,sawdust, and the like,and is designed especially for use in connectionwith the bagasseburning apparatus shown and described in the LettersPatent granted to me and numbered 564,918 and 591,752, respectively. Itwill, however, hereinafter be seen that my said invention is alsoadapted for use in burning coal and wood as well as bag-asse, sawdust,and the like.

In order to more fully describe my said invention, reference will be hadto the accompanying drawings, in which- Figure 1 represents one of mygrate-bars in side elevation. Fig. 2 is a top plan view showing two ofthe grate-bars in position, one being shown broken away. Fig. 3 is afragmentary plan view showing the lower side of a portion of one of thegrate-bars. Fig. 4 represents a section taken on the line44, Fig. 1, andlooking in the direction of the arrow. Fig. 5 represents a section takenon the line 5 5, Fig. 1. Fig. 5 represents in side elevation a crank forrotating the bars. Fig. 6 represents in side elevation another form ofgrate-bar embodying my invention. Fig. 7 represents a top plan view ofthe same. Fig. 8 represents a section taken along the line 8 8, Fig. '6;and Fig. 9 represents a section taken along the line 9 9, Fig. 6, andlooking in the direction of the arrow. Fig. 10 represents a fragmentarytop plan view of another form of my invention.

Similar letters refer to similar out the several views.

The grate-bar A is preferably made in one casting, having the lowerparallel tubular portions B, which extend upward, forming parts through-I are connected by the central the solid parts of the bar 0. These solidparts curved ribs D, which form the openings E.

Along each side of the grate-bar are the lugs F, which extend from thetubular por} tions B to the top of the bar, while at the ends of the barare the trunnions G and H, the trunnions G being hollow. I

The tubular portions B of the bar are closed at one end and open at theother into an airchamber J.

B 13 represent small apertures through the tubular portions B of thegrate for the escape of the air or steam. Plugs b are inserted in thetubes B and act as safety-plugs, which may be blown out if the pressurebecomes too great and act also as a means for allowing cinders or trashto be removed from the tubes.

These grate-bars may be rotatably mounted in the furnace in any suitableway. In the drawings I have shown them supported upon the trunnions bymounting the latter-via, the trunnion G in an air-box K, located in thefire-Wall, and the trunnion H in the bear ing L of the oppositefire-wall. The trunnion H is provided with a recess it, into which maybe inserted the end m of a crank M, by which the bar may be rotated.

Air or steam is forced into the grate-bar through the trunnion G,fromwhence it passes through the chamber J to the tubularportions B and thenout through the apertures 13. The lugs F extend out over the apertures13, and thus prevent them from becoming choked. The air or steam thusissuing from the gratebar greatly facilitates the combustion byfurnishing an increased draft, while at the same time prolonging thelife of the grate-bar by preventing the burning and warping of the same.In the complete furnace-grate a plurality of these bars are mountedalongside each other, as shown in Fig. 2.

In Figs. 6 to 9, inclusive, I have shown a form of grate-bar which whileembodying my present invention is in some respects different from theform above described. The bar A in this case is provided with theparallel tubular portions B and lugs F, as in the first form; but inthis case the central ribs D are omitted and the longitudinal centralribs D are employed, connecting at the center .of the bar with across-rib d. The lugs F differ from the lugs F in that the former aredovetail in section. The form of bar, Figs. 6 to 9, is shown as adaptedto be fixed in the furnace and not rotatable, as in the former case, theair entering the chamber J" through the pipeN and then passing into thetubular portions 13 and out through the apertures 13"; but it is obviousthat this form of bar may also be rotatably mounted by providing thesame with trnnnions, as shown in Fig. 10. It is also obvious that I donot confine myself to the precise construction herein shown, as the samemay be varied in many ways without departing from the spirit of myinvention.

Having thus fully described my said invention, what I claim, and desireto secure by Letters Patent of the United States, is-

1. A grate-bar comprising two longitudinal tubular portions, centralribs formed integral with and located between said tubular portions,aseries of lugs projecting from each side of said grate-bar, aperturesthrough the tubular portions of said grate-bar opening beneath saidlugs, means for mounting the grate-bar in a furnace, and means forconducting a blast fluid to the said tubular portions, substantially asdescribed.

2. A grate-bar comprising two longitudinal parallel tubular portions, aseries of central cross-ribs transverse to said bar integral with andlocated between said tubular portions forming a central row of openingsthrough said bar, a series of In gs formed on said gratebar andprojecting angnlarly above said tubular portions and from the sides ofthe gratebar, apertures formed in said tubular portions directly beneaththe angular face of said lugs, means for mounting the grate-bar in afurnace, and means for conducting ablast fluid to said tubular portions,substantially as described.

3. A grate-bar comprising two longitudinal parallel tubular portions, aseries of curved central cross-ribs transverse to said bars integralwith and located between said tubular portions forming a central row ofopenings through said bar, a series of lugs formed on said grate-bar andprojecting angnlarly above said tubular portions and from the sides ofthe grate-bar, apertures formed in said tubular portions directlybeneath the angular face of said lugs, a trunnion at each end of saidbar,one of said trunnions being hollow, means provided upon the othertrunnion for rotating said bar, and a chamber affording a communicationfrom the hollow trunnion to the said tubular portions, substantially asdescribed.

In testimony whereof I afiix my signature in presence of two witnesses.

JAMES FISHER.

Witnesses:

JOHN J. SAUOIER, E. W. 'BURBANK.

